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Finding the Fourth Proportional to 402.96, 555.71 and 255.63

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Solution

The fourth proportional to 402.96, 555.71 and 255.63 is: 352.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    402.96 : 555.71 = 255.63 : x
  2. Step 2: Convert to fraction form
    402.96/555.71 = 255.63/x
  3. Step 3: Cross multiply
    402.96x = 555.71 × 255.63
  4. Step 4: Simplify right side
    402.96x = 142,054.87
  5. Step 5: Solve for x
    x = 142,054.87/402.96
  6. Step 6: Final answer
    x = 352.53

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.